from flask import abort, jsonify
from flask import current_app
from flask import request

from info.utils.common import user_login_data

from flask import g
from flask import render_template
from flask import session

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.response_code import RET


@news_blu.route('/comment_like', methods=['POST'])
@user_login_data
def comment_like():
    """评论点赞"""
    user = g.user
    # 如果用户不存在
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登入")

    # 取到请求参数
    news_id = request.json.get('news_id')
    comment_id = request.json.get('comment_id')
    action = request.json.get('action')

    # 判断参数
    if not ([news_id, comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询评论并判断评论是否存在
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    # 如果评论不存在
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="评论不存在")

    if action == "add":
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id, CommentLike.comment_id == comment.id).first()

        # 点赞评论
        if not comment_like_model:
            # 初始化评论模型,并赋值
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)

    else:
        # 取消点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id, CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")

    return jsonify(errno=RET.OK, errmsg="OK")


@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """评论新闻或回复评论"""
    user = g.user
    # 如果用户不存在
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登入")

    # 取到请求参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')

    # 判断参数
    if not ([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻并判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    # 如果新闻不存在
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    # 初始化评论模型,并赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg="ok", data=comment.to_dict())


@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def collect_news():
    """收藏新闻"""
    user = g.user
    # 如果用户不存在
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登入")

    # 接收参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')

    # 判断参数
    if not ([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ["collect", "cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询新闻并判断新闻是否存在
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据查询错误")

    # 如果新闻不存在
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到新闻数据")

    if action == "cancel_collect":
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)

    else:
        # 收藏
        # 如果新闻不在用户的收藏列表里面
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """新闻详情"""

    # 查询用户登入信息
    user = g.user

    # 右侧的新闻排行逻辑
    # 创建对象列表
    news_list = []
    try:
        # order by 排序查询、asc升序、desc降序
        # LIMIT 子句可以被用于强制 SELECT 语句返回指定的记录数。
        # LIMIT 接受一个或两个数字参数。参数必须是一个整数常量。
        # 如果给定两个参数，第一个参数指定第一个返回记录行的偏移量，
        # 第二个参数指定返回记录行的最大数目。初始记录行的偏移量是 0(而不是 1)
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)

    # 创建字典列表
    news_dict_li = []
    # 遍历对象列表,将对象的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        abort(404)

    # 更新新闻的点击次数
    news.clicks += 1

    is_collected = False

    # 如果用户已经登入
    if user:
        # 判断用户是否收藏新闻,如果收藏
        if news in user.collection_news:
            is_collected = True

    comments = []
    # 查询评论数据
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []
    if g.user:
        try:
            # 需求: 查询当前用户在当前新闻都点赞了哪些评论
            # 查询当前新闻所有评论并取到评论id
            comment_ids = [comment.id for comment in comments]
            # 查询当前评论中哪些评论被用户点赞
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids), CommentLike.user_id == g.user.id).all()
            # 取到被点赞的评论id
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        # 代表没有点赞
        comment_dict["is_like"] = False
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li
    }

    return render_template("news/detail.html", data=data)
